Not sure if this is really much better than any of the other lock solutions shown so far, but it worked great last year on the trip down to the Rubithon from Portland, and back. No issues at all. I was going to fashion some sort of metal bar, but this HDPE prototype is so quiet and works great, I just left it in. It could for sure be made prettier, but doesn't bother me. I like that the shifter is able to move around and never really ride on the stop at all in normal driving. It only bumps into the plastic stop when it's working its way out of gear, but hasn't popped out once. I had all the parts in my garage already: a cheap cabinet hinge, some IKEA cutting board, a mismatched colection of hardware, and even the hose barb plug. It took a little bit of trial and error to make it the right size and placement so both the H and L settings still have some movement, but don't let it slip out of gear, but it has so far been 100%. Would take some adjustments to the design to use with a pretty boot, but I'm not too worried about pretty. The slotted foam keeps about as much noise out as the original rubber part, and I've driven it in Oregon rain a bunch and never had any water ingress. I'm calling this solved on my end. Any wear on the fork from the few seconds it's rubbing while trying to walk out of gear when rubbed up against the plastic lockout will likely take more time than I have left driving this to cause any problems.
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